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Year 7 Interactive Maths - Second Edition


Perimeter of a Triangle

Recall that:

The perimeter is the distance around a closed plane figure.

 

The perimeter, P, of a triangle is given by the formula

P = a + b + c

where a, b and c are the side lengths of the triangle.

Triangle with sides of length a, b and c


Example 11

Find the perimeter, P, of the triangle shown below.

Triangle

Solution:

P = 12 + 9 + 7 = 28

So, the perimeter is 28 cm.


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